Compilare: main.cpp: In function 'int ask(int, int)': main.cpp:41:9: warning: unused variable 'mid' [-Wunused-variable] int mid; ^~~ main.cpp: In function 'int f(int)': main.cpp:27:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:68:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.in","r",stdin); ^ main.cpp:69:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.out","w",stdout); ^